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1
61
62
63
64 package org.jaxen.expr;
65
66 import java.util.ArrayList  ;
67 import java.util.List ;
68 import org.jaxen.Context;
69 import org.jaxen.JaxenException;
70
71 public class DefaultFilterExpr extends DefaultExpr implements FilterExpr, Predicated
72 {
73 private Expr expr;
74 private PredicateSet predicates;
75
76 public DefaultFilterExpr(PredicateSet predicateSet)
77 {
78 this.predicates = predicateSet;
79 }
80
81 public DefaultFilterExpr(Expr expr, PredicateSet predicateSet)
82 {
83 this.expr = expr;
84 this.predicates = predicateSet;
85 }
86
87 public void addPredicate(Predicate predicate)
88 {
89 this.predicates.addPredicate( predicate );
90 }
91
92 public List getPredicates()
93 {
94 return this.predicates.getPredicates();
95 }
96
97 public PredicateSet getPredicateSet()
98 {
99 return this.predicates;
100 }
101
102 public Expr getExpr()
103 {
104 return this.expr;
105 }
106
107 public String toString()
108 {
109 return "[(DefaultFilterExpr): expr: " + expr + " predicates: " + predicates + " ]";
110 }
111
112 public String getText()
113 {
114 String text = "";
115 if ( this.expr != null )
116 {
117 text = this.expr.getText();
118 }
119 text += predicates.getText();
120 return text;
121 }
122
123 public Expr simplify()
124 {
125 this.predicates.simplify();
126
127 if ( this.expr != null )
128 {
129 this.expr = this.expr.simplify();
130 }
131
132 if ( this.predicates.getPredicates().size() == 0 )
133 {
134 return getExpr();
135 }
136
137 return this;
138 }
139
140
142 public boolean asBoolean(Context context) throws JaxenException
143 {
144 Object results = null;
145 if ( expr != null )
146 {
147 results = expr.evaluate( context );
148 }
149 else
150 {
151 List nodeSet = context.getNodeSet();
152 ArrayList list = new ArrayList (nodeSet.size());
153 list.addAll( nodeSet );
154 results = list;
155 }
156
157 if ( results instanceof Boolean )
158 {
159 Boolean b = (Boolean ) results;
160 return b.booleanValue();
161 }
162 if ( results instanceof List )
163 {
164 return getPredicateSet().evaluateAsBoolean(
165 (List ) results, context.getContextSupport()
166 );
167 }
168
169 return false;
170 }
171
172 public Object evaluate(Context context) throws JaxenException
173 {
174 Object results = getExpr().evaluate( context );
175
176 if ( results instanceof List )
177 {
178 List newresults = getPredicateSet().evaluatePredicates( (List ) results,
179 context.getContextSupport() );
180 results = newresults;
181 }
182
183 return results;
184 }
185 public void accept(Visitor visitor)
186 {
187 visitor.visit(this);
188 }
189 }
190 |
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